Study Of The Mechanism Of Static Penetration In Mollisol And The Relationship Between Static Penetration And Soil Parameters

In geotechnical engineering of in situ test,static cone penetration of the existing engineering instance data is rich,it is easy to use,application scope is widespread,is one of the most common form of in situ experiments,the mechanism of static sounding and many other projects have similar parts,such as the calculation of bearing capacity of single pile,but has some differences in details.Therefore,it is necessary to study the mechanism of static penetration.Many scholars at home and abroad over the years for the mechanism of static sounding the direction of research work for many different angles,although have also made many research results,but because of the uncertainty,the mechanical properties of soil itself and the complexity of the real soil ultra-high makes modeling is very difficult to match the real situation of soil,and as a result of the penetration process of deformation force produced by the probe near amplitude is very big,can make the simulation conditions produce certain distortion,which makes the experiment and simulation of the two ways to obtain the corresponding data method can guarantee the accuracy of the data,this makes the study of the mechanism has high difficulty and uncertainty.So today the results of static sounding mechanism for study or not satisfactory,most research results are obtained by experiment and data analysis,corresponding,before also some scholars through the finite element modeling software to simulate the process of static sounding,had some argument to analyze its mechanism,but because everyone is a large difference between the established model,so their income has a very big difference between the results.In this paper,the finite element software of ABAQUS is used to simulate and analyze the whole penetration process of static probe.The analysis results are compared with the formulas obtained from the data analysis of previous experiments.Main research contents of this paper:(1)Introduce the domestic and foreign research status of static penetration mechanism,introduce the development history of specifications and functions of static penetration instruments,introduce the development process of static penetration theory,and introduce the empirical formula or semi-empirical company summarized by domestic and foreign scholars.(2)This paper introduces the different theoretical methods of bearing capacity obtained from previous studies on the mechanism of static contact,and expounds the development history,theoretical assumptions and advantages and disadvantages of these theories compared with other theories.(3)Through the finite element simulation software Abaqus,the whole penetration process of static touchdown is simulated,and the stress and strain of soil is analyzed during the penetration process of static touchdown and when the penetration reaches the end point.(4)By modifying the parameters related to the soil and the static contact results,such as the Angle of internal friction,cohesion,modulus of elasticity,and the influence of theseparameters on the resistance of the cone tip,side friction resistance and friction ratio can be obtained,and these data are regressed in the SPSS data analysis software to obtain the corresponding regression equation.(5)At the same time,the cohesion c and the Angle of internal friction of the soil were changed to find out the influence of the cohesion c and the Angle of internal friction on the side friction resistance,and the relevant data between the cohesion,the Angle of internal friction and the side friction resistance were established.(6)To Lilin static sounding with the experimental data obtained in the triaxial experimental section,select static sounding by the cone tip resistance and side friction resistance and friction ratio,triaxial experiments of cohesive force and Angle of internal friction of soil test of the data after eliminating abnormal data,import the regression analysis in SPSS software related monadic regression equation is obtained and binary regression equation,a result that will compare with the results of the front in the process of simulation analysis.